It is my opinion that one should strongly distrust any information source which suggests that current will try to seek ground. Electric current does _not_ 'seek ground'. Instead the current follows any closed circuit back to its _source_.
In the case of current transformers, the source is the transformer winding itself. Open CT windings can develop quite high potential, enough to arc in order to close the circuit. With some of the secondary terminals properly loaded with a low impedance, it will depend upon the specific layout of the transformer to determine if any of the other terminals need to be shorted.
-Jon
